Oligocene Hear it!

Oligocene Definition

Oligo·cene (äl′i gō sēn′)

adjective

designating or of the third and last geologic epoch of the Paleogene, characterized by cold climate, the formation of vast grasslands, and the further development of mammals

Etymology: oligo- + -cene

Oligocene Idioms

the Oligocene

the Oligocene Epoch or its rocks